Thanks to all who responded publicly and privately to my question about failure points/spare parts/maintenance on greenhouse heaters. I appreciate all the input. I'll keep a spare igniter module, as Roy mentioned, and depending on price a couple of other items too such as the ignition control board. Mark Mazer had several good suggestions, including a good long cleaning brush and spare fuses, for heaters that have internal fusing. I think Arnold mentioned thermal mass, in the form of water. I'm a big believer, and during what is known locally as the Great Ice Storm of 2009 it saved a lot of our plants. We have a 350 gallon tank of RO water, and I had stacked scores of old cat litter jugs filled with water under the tables. We were without power for more than 3 days, with low temperatures around 12 F each night. What we couldn't triage to the house had to take its chances. All that water provided over 150 million calories, and the temperature in the greenhouse never fell below 32 F. We lost a few things, but far less than I feared. Bizarrely, some hybrid Phalaenopsis orchids were all in bloom 6 weeks later. Steve On 11/1/2021 9:58 AM, Roy Herold wrote: > I'll add my two cents (two BTUs?): ... _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>